I would think it might have something to do with the acid level in fresh pineapple, but I would think that would also stand for canned pineapple. And heck! Even oranges, or grapefruit. So really..I have no idea! I'd just guess something about acid in it.
Pineapple has some
very effective properties to help you in the process of self induce
labor. It contains bromelain that is a proteolytic kind of enzyme.
Basically it helps in the digestion of proteins in your food. However,
when you take it before meals when your stomach is empty then it works
like a medicine. It has anti-inflammatory properties so we use it in
naturopathy for lessening the swelling and pain. Mango and papaya are
two other fruits that have similar properties and are very useful in
natural methods used to induce labor pain.However, to get the real benefit from pineapple you should use it
when it is fresh only. Bromelain found in the fresh pineapples helps
the connective tissues of cervix in bringing natural labor. If you use
canned pineapple it will not produce the desirable results because
bromelain is ruined in the process.
I ate a whole flipping pineapple and all it did for me was give me horrendous heartburn, mouth ulcers, and a wound up, kickboxing baby for the evening. She did not budge...was way too happy in there. I hope it works for you if you try it.
I probably ate 5 pineapples at the end of my pregnancy. But it tasted soo good to me at the time since I was hot and not much else was appealing besides fruit and popsicles. :-)
Re: Why fresh pineapple?
Using Pineapple, Mango And Papaya
Pineapple has some very effective properties to help you in the process of self induce labor. It contains bromelain that is a proteolytic kind of enzyme. Basically it helps in the digestion of proteins in your food. However, when you take it before meals when your stomach is empty then it works like a medicine. It has anti-inflammatory properties so we use it in naturopathy for lessening the swelling and pain. Mango and papaya are two other fruits that have similar properties and are very useful in natural methods used to induce labor pain.However, to get the real benefit from pineapple you should use it when it is fresh only. Bromelain found in the fresh pineapples helps the connective tissues of cervix in bringing natural labor. If you use canned pineapple it will not produce the desirable results because bromelain is ruined in the process.
https://www.savvy-baby-gear.com/baby-articles/self-induce-labor/
Can't tell I'm bored and can't sleep or anything

Interesting. Thanks!